clock



(No Model.) 2 Sheets-Sheet 1.

J'. M. CLOCK. TOOLv GRINDER. No. 476,872. I JPatented June 14, 1892.

fi a Iy j I lig;

67o I c; d] T rjgltxft'.

' G iff-:iff y d wf/Vm? WFA/55555 :as no.. Pnmmno., WASHINGTON mc.

(No Model.)

J. M. CLOCK. TOOL GRINDBR.

Sil

2 Sheets-Sheet 2.

Patente-d June 14, 1,892.

Unteren STATES PATENT OFFICE.

JESSE M. CLOCK, OF NEV YORK, N. Y.

TOOL-GRINDER.

SPECIFICATION forming part Of Letters Patent N0. 476,872, dated June 14, 1892.

Application filed November 17, 1891. Serial No. 412.146. (No model.)

To @ZZ whom it may concern.-

Beit known that I, JESSE M. CLOCK, a citizen of the United States, residing at New York, county and State of New York,have invented new and useful Improvements in Tool-Grind ers, of which the following is a specification, reference being had to the accompanying drawings, making part thereof.

My invention relates to machines 'forgrinding plane-irons and other similar tools with a bevel edge; and it consists of certain novel devices to be used for presenting the desired tool to the face of the stone, as hereinafter more fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 represents a partial side View and partial longitudinal section of atool-grinder embodying my invention. Fig. 2 represents a plan or top View thereof. Fig. 8 represents an inside view of a standard detached with the grooves and bars and on a larger scale than in preceding ligures. Fig. 4 represents a like View of a standard with two grooves and bars. Fig. 5 represents a side view of a cross-bar.

Similar letters of referenceindicate similar parts.

The letter A indicates the grindstone, and B its shaft, by which the stone is mounted'in the bench C, and which shaft has a crank ll, connected by the pitman e with a treadle F, for imparting to the stone a revolving motion.

At each side of the stone A, and ata point central thereof, is a standard G, which is attached at its base to a side rail C of the bench and formed with vertical grooves G on its inner surface, said grooves coinciding with each other as to the two standards.

Referring to Figs. '1, 2, and 3, in the grooves G of the standards are itted the ends of cross-bars Z Z Z2, which are at a point above and contiguous to the face of the grindstone, the middle bar Z lying inthe vertical plane of the axis of the stone parallel to such axis, and the outer bars Z Z2 being equidistantfrom said middle bar. The purpose of these crossbars Z Z Z2 is to sustain the tool o as it is pre sented to the face of the grindstone-that is to say, if the tool islaid upon one of the outer bars with its edge under or against the middle bar shown said outer bar acts as a rest or fulcrum and said middle bar as a stop or abutment for the tool, so that but a very slight pressure need be exerted upon the tool by the operator for effecting the desired grinding, the tool at the same time affording asupport to the hands of the operator, which is a desideratum.

By the tool presented to the vstone as above stated a uniform wear of the stone is produced of soft spots in the stone by either outer bar Z or Z2 and the flow of watersupplied to the stone is controlled,preventing the water from spraying by centrifugal force against the operator.

Three bars Z Z Z2 are used in order to permit of reversing the angle or position of the tool upon the machine in grinding; but, if den sired, one of the outer bars may be omitted, inasmuch as only two of the bars are in actual use at any one time in Figs. 4 and l.

The standardsG are connected together by screw-bolts J, usually two in number, which may alternate in position with the cross-bars Z Z Z2, and when these bolts are tightened said bars are thereby clamped endwise against the standards, causing the bars to effectually retain the desired position, while if said bolts are loosened the bars are free to move up or down in the vertical grooves Gr', permitting the same to be adjusted in relation to the grindstone. Hence the bars Z Z Z2 may be readily adapted to a holding of the tool o at a different degree of angle for varying the bevel of its edge ground by the stone, the middle bar being raised or lowered for that purpose. ln order to adapt the screwbolts J to the vertical adjustment of the crossbars Z Z Z2, the standardsG may have vertical rows of holes J or vertical slots J, Fig. 4, for the passage of said bolts.

The grooves G' and bolts J constitute a simple and effective means for adjusting the crossbars Z, dac.; but any other suitable means maybe employed for thatpurpose, and when the bars are simply to be lowered in order to compensate for wear of the stone, each of the side rails C of the bench may be composed of planks laid one upon the other and fastened together, as shown Fig. 1, said planks being removed in succession to lower ICO the bars, together with the standards, Without releasing the bars.'

The treadle F is pivoted, as at t, to one end leg C2 of the bench and it works in a slot n, of the other end leg on the same side of the machine, a spring 2J being generally used to facilitate the operation of the treadle. To

the treadle F is connected another or auxil.

iary treadlep, which extends approximately at a right angle thereto, as shown, and which 1n practice is fitted at or near its free end in a guide 7c,.Fig. 2, affixed to the floor. This auxiliary treadle p enables the operator to work the main treadle Fwith convenience by either foot at one end of the machine without changing his position, and also increases the leverage exerted on the crank D for driving the stone.

In order to better adapt the auxiliary treadle p to the swinging motion of the main t1 eadle F, its connection thereto is effected by a swivel-joint s, composed of a hook and one of a series of staples s', arranged at different points along the main treadle to receive said hook, the series of staples permitting the auxiliary treadle to be connected with the main treadle at different points'for varying the speed of motion of the grindstone.

What I claim as new, and desire to secure by Letters Patent, is-

1. A toolgrinder having, in combination with a grindstone, cross-bars above and contiguous to the face of the stone, one forming a rest and fulcrurn and another a stop or abutment for the tool, and supports for said. *bars constructed to permit adjustment thereof in relation to the stone, substantially as and for the purpose described.

2. A tool-grinder having, in combination with a grindstone, standards on opposite sides and central of the stone, constructed with vertical grooves on their inner surfaces, crossbars the ends ot` which are fitted in said grooves ot the standards at points to bring the bars above. and contiguous to the face of the stone, and screw-bolts connecting the standards for clamping the bars endwise,sub stantially as and for the purpose described.

JESSE M. CLOCK. Witnesses:

Louis W. FROST,

R. T. VAN BosKERcK.

It is hereby certified that in Letters Patent No. 476,872, granted June let, 1892, upon the application of Jesse M. Glock, of New York, N. Y., for en improvement in Tool- Grnders, errors appear in the printed specification requiring correction, as follows: In line 62, page l, at comme should be inserted after the Word stone, and in line 63, same page, the Word and should be stricken ont; and thetthe Letter-s Patent should he read with these corrections therein that the seme may conform to the record ofthe case in the Patent Office.

Signed, countersigned, and sealed this 28th day of June, A; Dfl892.

[SEAL] GEO. CHANDLER,

First Assistant Secretary of the Interior. Countersigned z W. E. SrMoNDs,

Commissioner of Patents. 

